They said the glass defect could lead to a loss of carbonation and the potential for small pieces of glass falling into the beer.

The brewery says they have sourced new glass bottles from a different production plant and will begin using those bottles on Thursday.

If you have Karben4 beer filled in the suspected time window of the defect, do not drink the beer. You can email info@karben4.com or send them a Facebook direct message and they will work with you about getting a refund.

You can also go into the Karben4 taproom to exchange your beer for a $10 refund if you are in the Madison area.

Check the “Bottled On Date” printed on the neck of the beer bottle to see if your beer is affected.